Detectives investigating the murder of model Sally Anne Bowman say they are following a number of strong leads after an appeal on the BBC1 Crimewatch programme.

Det Chief Insp Stuart Cundy said they had been given names of possible suspects and details of similar attacks.

He also said there was a "strong chance" that an attack on a woman in 2000 could be linked to Sally Anne's murder on September 25.

The Crimewatch programme, screened last night, showed CCTV footage of Sally Anne enjoying a night out, hours before she was murdered.

The footage shows the 18-year-old in Lloyds Bar, Croydon, chatting with friends on the evening of Saturday September 24.

Dressed in a short denim skirt and white corset top, she can be seen with a female friend at various times throughout the night queuing at a packed bar and mingling with the other customers.

The footage shows the 6ft blonde leaving the bar just after 1am and standing outside for about ten minutes talking to other late-night revellers. It's known she then left the area to go to a friend's house.

But she can be seen returning to the area outside Lloyds Bar shortly after 2am, having taken a cab back into the town centre. Her ex-boyfriend Lewis Sproston, who is not a suspect, is known to have picked her up from outside the bar and dropped her off at her house in Croydon.

Her killer is thought to have struck between 4.15 and 4.30am, shortly after Mr Sproston left her. During the frenzied attack she was sexually assaulted and stabbed several times.

Forensic evidence links the killing to a sex attack on a woman in nearby Purley in 2001 and there are possible links with at least six other assaults.

Police yesterday announced a £20,000 reward for anyone with information leading to the capture of Sally Anne's killer, a figure matched by the Sun newspaper.

Police also issued a series of hi-tech computer generated e-fits of the suspect's face showing a white man with dark, short spiky hair.

The e-fit was compiled with the help of a 36-year-old woman who was robbed and beaten with an iron bar just an hour before Sally Anne was attacked.

Another image of the suspect showed him wearing a brown jumper, black trousers and black shoes.

A separate full-body e-fit was compiled with the help of a witness who saw a man in Blenheim Crescent, where Sally Anne's body was found, around the time of the murder.

It also showed a white man with dark spiky hair wearing a light brown jumper, black trousers and black shoes.